Pratt & Whitney J58

Originally designed by Pratt & Whitney to power a projected Navy aircraft, the J58 eventually powered the SR-71 Blackbird. This engine was a turbo-ramjet, with the turbine being largely bypassed at high speed.
The J58 is also known as the JT11B.


  • J58: 32,500 lb (145 kN) thrust


  • Turbojet
  • Compressor: 9-stage axial (single spool)
  • Turbine: 2-stage axial

used by

  • Lockheed SR-71 Blackbird